Canon has officially released Firmware v1.2.4 for the Canon EOS-1D X incorporating the following improvements and fixes:

Improves the speed of the camera’s acquisition of focus when using a Canon Speedlite’s AF-assist beam.

Reduces the time it takes to display the metering result on the LCD or Viewfinder when the meter has been activated.

Fixes a phenomenon in which a “Caution 02” message is unnecessarily recorded in the camera status log.

Fixes a phenomenon in which continuous shooting pauses when using a Canon Speedlite.

Fixes a phenomenon, when the Canon GP-E1 is attached, in which the GPS device settings are reset to default settings when the camera has been powered off.

Note: *This phenomenon occurs only with firmware Ver. 1.2.1. After changing the GPS device settings, please be sure to power off the camera before removing the battery. This will ensure that the camera's GPS device settings will be saved.

Firmware Version 1.2.4 is for cameras with firmware version 1.2.1 or earlier. If your camera’s firmware is already Version 1.2.4, it is not necessary to update the firmware. When updating your camera’s firmware, please review the instructions thoroughly before you update the firmware.

Has anyone been able to find the firmware update for Mac...it still says 1.2.1 whereas for Windows 1.2.4...I guess just a matter of time...waiting....waiting (probably not a wise financial decision to buy a new computer system for update purposes )
Eric

Wow, I just noticed I'm still on 1.0.6... Anyone notice any performance changes (particularly AF speed/lock/consistency) with the various firmwares (good or bad). I'm always a bit wary about updating when things seem to be working fine.